U.S. patent number 10,792,148 [Application Number 15/625,419] was granted by the patent office on 2020-10-06 for intraocular lens with single lens telescope integrated in the optical part thereof.
This patent grant is currently assigned to Carl Zeiss Meditec AG. The grantee listed for this patent is Carl Zeiss Meditec AG. Invention is credited to Werner Fiala, Mario Gerlach.
![](/patent/grant/10792148/US10792148-20201006-D00000.png)
![](/patent/grant/10792148/US10792148-20201006-D00001.png)
![](/patent/grant/10792148/US10792148-20201006-D00002.png)
![](/patent/grant/10792148/US10792148-20201006-D00003.png)
![](/patent/grant/10792148/US10792148-20201006-D00004.png)
![](/patent/grant/10792148/US10792148-20201006-D00005.png)
United States Patent |
10,792,148 |
Gerlach , et al. |
October 6, 2020 |
Intraocular lens with single lens telescope integrated in the
optical part thereof
Abstract
An intraocular lens is provided. The intraocular lens includes
an optical part and an adjoining haptic part. The optical part
includes an optically imaging element and a telescope, the entire
telescope being integrally formed and being integrated in the
optical imaging element. The optically imaging element has a
convexly-curved front side and a concavely-curved rear side.
Further, the optically imaging element is arranged as a single lens
system.
Inventors: |
Gerlach; Mario
(Glienicke-Nordbahn, DE), Fiala; Werner (Vienna,
AT) |
Applicant: |
Name |
City |
State |
Country |
Type |
Carl Zeiss Meditec AG |
Jena |
N/A |
DE |
|
|
Assignee: |
Carl Zeiss Meditec AG (Jena,
DE)
|
Family
ID: |
1000005094459 |
Appl.
No.: |
15/625,419 |
Filed: |
June 16, 2017 |
Prior Publication Data
|
|
|
|
Document
Identifier |
Publication Date |
|
US 20170281335 A1 |
Oct 5, 2017 |
|
Related U.S. Patent Documents
|
|
|
|
|
|
|
Application
Number |
Filing Date |
Patent Number |
Issue Date |
|
|
PCT/EP2015/080314 |
Dec 17, 2015 |
|
|
|
|
Foreign Application Priority Data
|
|
|
|
|
Dec 18, 2014 [DE] |
|
|
10 2014 119 010 |
|
Current U.S.
Class: |
1/1 |
Current CPC
Class: |
A61F
2/1651 (20150401); A61F 2002/1689 (20130101); A61F
2002/1683 (20130101); A61F 2250/0053 (20130101) |
Current International
Class: |
A61F
2/16 (20060101) |
Field of
Search: |
;623/6.34 |
References Cited
[Referenced By]
U.S. Patent Documents
Foreign Patent Documents
|
|
|
|
|
|
|
69431428 |
|
Jun 2003 |
|
DE |
|
69921648 |
|
Nov 2005 |
|
DE |
|
112010004191 |
|
Nov 2012 |
|
DE |
|
0897702 |
|
Feb 1999 |
|
EP |
|
1818023 |
|
Aug 2007 |
|
EP |
|
1103399 |
|
Nov 1955 |
|
FR |
|
Other References
International Search Report dated Mar. 21, 2016 of international
application PCT/EP2015/080314 on which this application is based.
cited by applicant .
Written Opinion of the International Searching Authority in
PCT/EP2015/080314 (from which this application claims priority)
dated Mar. 21, 2016 and English-language translation thereof. cited
by applicant.
|
Primary Examiner: Prebilic; Paul B
Attorney, Agent or Firm: Ewers; Falk Ewers IP Law PLLC
Parent Case Text
CROSS REFERENCE TO RELATED APPLICATIONS
This application is a continuation application of international
patent application PCT/EP2015/080314, filed Dec. 17, 2015,
designating the United States and claiming priority to German
application 10 2014 119 010.6, filed Dec. 18, 2014, and the entire
content of both applications is incorporated herein by reference.
Claims
What is claimed is:
1. An intraocular lens comprising: an optical part including an
optically imaging element and a convex-concave telescope; and a
haptic part connected to the optical part; the convex-concave
telescope being formed in one piece, being integrated into the
optically imaging element, having a convexly-curved front side and
a concavely-curved rear side, being arranged as a single lens, and
being a solid cavity-free arrangement; the convexly-curved front
side of the convex-concave telescope having a convex curvature for
facing towards incident light entering the intraocular lens; the
concavely-curved rear side of the convex-concave telescope having a
concave curvature for facing away from the incident light; the
convexly-curved front side of the convex-concave telescope having a
first radius; the concavely-curved rear side of the convex-concave
telescope having a second radius; and the first radius being larger
than the second radius, wherein the optical part of the intraocular
lens defines an optical main axis, wherein the optically imaging
element radially adjoins the convex-concave telescope, and wherein
the convex-concave telescope extends on both sides of the
intraocular lens beyond the optically imaging element when viewed
in a direction of the optical main axis of the optical part.
2. The intraocular lens of claim 1, wherein: the optical part of
the intraocular lens defines an optical main axis, the first radius
is defined in a direction perpendicular to the optical main axis of
the intraocular lens, and the second radius is defined in the
direction perpendicular to the optical main axis of the intraocular
lens.
3. An intraocular lens comprising: an optical part including an
optically imaging element and a convex-concave telescope; and a
haptic part connected to the optical part; the convex-concave
telescope being formed in one piece, being integrated into the
optically imaging element, having a convexly-curved front side and
a concavely-curved rear side, being arranged as a single lens, and
being a solid cavity-free arrangement; the convexly-curved front
side of the convex-concave telescope having a convex curvature for
facing towards incident light entering the intraocular lens; the
concavely-curved rear side of the convex-concave telescope having a
concave curvature for facing away from the incident light; the
convexly-curved front side of the convex-concave telescope having a
first radius; the concavely-curved rear side of the convex-concave
telescope having a second radius; the first radius being larger
than the second radius; and a kink, wherein: the convexly-curved
front side of the convex-concave telescope facing towards the
incident light entering the intraocular lens has a first radius,
the optically imaging element has a front side, the front side of
the optically imaging element has a second radius, the first radius
is smaller than the second radius, and the kink is formed at a
contour transition between the convexly-curved front side of the
convex-concave telescope and the front side of the optically
imaging element.
4. The intraocular lens of claim 1, further comprising: a kink,
wherein: the convex-concave telescope has a lateral wall, the
optically imaging element has a rear side, the concavely-curved
rear side of the convex-concave telescope facing away from the
incident light entering the intraocular lens opens into the lateral
wall of the convex-concave telescope, and the kink is formed at a
contour transition between the lateral wall and the rear side of
the optically imaging element.
5. The intraocular lens of claim 1, wherein the optically imaging
element is a monofocal lens.
6. The intraocular lens of claim 1, wherein the optically imaging
element is a monofocal ring lens.
7. The intraocular lens of claim 1, wherein: the optical part of
the intraocular lens defines an optical main axis, and a central
thickness of the intraocular lens as measured along the optical
main axis is less than 2 mm.
8. The intraocular lens of claim 1, wherein: the optical part of
the intraocular lens defines an optical main axis, and a central
thickness of the convex-concave telescope as measured along the
optical main axis is less than 2 mm.
9. The intraocular lens of claim 1, further comprising: at least
one of a first diffractive structure arranged on the
convexly-curved front side of the convex-concave telescope facing
towards the incident light entering the intraocular lens and a
second diffractive structure arranged on the concavely-curved rear
side of the convex-concave telescope facing away from the incident
light.
Description
TECHNICAL FIELD
The invention relates to an intraocular lens including an optical
part and an adjoining haptic part. The optical part includes an
optically imaging element and a telescope.
BACKGROUND
The human eye may be afflicted by very different visual defects on
account of its relatively complex structure and hence also, in
particular, on account of the parts provided for optical imaging
and/or other influencing factors. Individually, these may be
differently pronounced in terms of strength; on the other hand, a
plurality of different visual defects also may be present in an
eye.
Eye lenses for correcting visual defects are known in the form of
intraocular lenses with multifaceted configurations.
By way of example, such an intraocular lens is known from U.S. Pat.
No. 5,391,202. Intraocular lenses including a telescope extend a
visual field of a patient suffering from a degeneration of the
macula. In the case of macular degeneration, the affected persons
are unable to read without special telescopic or microscopic
spectacles which produce a magnification of the object on the
retina and hence on the macula.
However, the structure is very complex in the known intraocular
lens and it is difficult to produce said intraocular lens. This is
because the intraocular lens requires a plurality of separate
parts; namely, firstly, a body element which may have a biconvex or
plano-convex configuration. Centrally in the middle, this body
element has a continuous bore, in which separate lens elements of
the telescope, arranged at a distance from one another, are
positioned. Provision may be made for the lens element to have an
integral embodiment with the body element. However, the second lens
element must necessarily be provided as a separate part in all
cases since a gas filling must be introduced into a cavity between
the two lens elements and since, necessarily, such a cavity must
also be formed. As a result of this configuration, the positioning
of the two convex lenses in relation to one another is very
difficult and not possible with a permanently secured position. As
a result, unwanted imaging properties of the telescope formed from
a plurality of separate lenses may emerge and hence the intraocular
lens may only provide limited improvement in view of its specific
functionality for adapting the visual range of a patient with
macular degeneration.
An intraocular lens which likewise includes a telescope is known
from U.S. Pat. No. 9,622,852. Two separate lens elements for
constructing the telescope are also provided there in a mandatory
fashion, said two separate lens elements being connected by way of
connection elements in order to be able to facilitate a relative
movability of the two lens elements of the telescope. This
configuration also has a very complex structure and it is difficult
to produce, and as a result, a limited functionality in view of the
visual field design for a patient with macular degeneration also
occurs in this case.
Moreover, U.S. Pat. No. 6,066,171 describes an intraocular lens
with a swivelable telescope. In view of the complexity, the
structure therein exceeds the embodiments as specified in the two
aforementioned documents of the related art.
In addition, the respective thickness, in particular the central
thickness of the intraocular lens, is very large in all embodiments
and the intraocular lens as such is relatively rigid on account of
the configuration. This has a significant disadvantage because it
can only be folded to a relatively qualified extent and therefore
it is unsuitable for an implantation, which is suitable for a small
incision, into the eye. Therefore, the implantation into an eye, in
particular into a capsular bag, is linked to relatively large
incisions in the case of such known lenses which, in turn, is also
disadvantageous for the patient.
Moreover, the optical part is formed by the telescope in the two
known intraocular lenses mentioned above. This has substantial
disadvantages in view of the further vision of the patient in the
case of specific imaging of the incident light. Additionally, the
field of vision is restricted in any case by the holding mechanism
or by the carriers, which respectively hold this telescope, in
these known intraocular lenses as these required carriers do not
contribute to the optical imaging.
SUMMARY
It is an object of the present invention to provide an eye lens by
which the visual defect AMD (age-related macular degeneration) may
be corrected in an improved manner.
The object is achieved by providing an intraocular eye lens having
an optical part including an optically imaging element and a
telescope and a haptic part connected to the optical part. The
telescope has an integral embodiment, i.e., is formed in one piece,
is integrated into the optically imaging element, has a
convexly-curved front side and a concavely-curved rear side, and is
a convex-concave telescope arranged as a single lens system. The
convexly-curved front side of the telescope has a convex curvature
and faces towards incident light entering the intraocular lens. The
concavely-curved rear side of the telescope has a concave curvature
and faces away from the incident light.
An intraocular lens according to an aspect of the invention
includes an optical part and an adjoining optically ineffective
haptic part. The optical part, and hence an imaging part acting in
an optically defined manner, includes an optically imaging element
and a telescope. This means that at least two different optically
effective components are present in this case. Therefore, within
the context of the invention, this should not be understood to mean
that the telescope is also the entire optically imaging element at
the same time.
According to an aspect of the invention, the telescope is a
complete or entire telescope having an integral embodiment and
being integrated into the optically imaging element. This means
that, therefore, the entire telescope is also embodied in integral
fashion with the optically imaging element and also preferably
produced in an integral fashion with the optically imaging element.
Hence, the optical part of this intraocular lens is embodied with
two separate optically effective components, in particular
components with different optical effects. The components, however,
are produced and provided in a common composite. This integral
configuration is such that the optically imaging element and the
telescope are not overlaid but embodied adjacent to one another and
hence embodied lying next to one another and each image with an
individual optical effect.
This intraocular lens according to an aspect of the invention is
embodied to adapt the visual field and hence, in particular, to
extend a visual field in the case of macular degeneration. This
specific design of the optical part substantially improves this
visual field adaptation in comparison with intraocular lenses from
the related art. By way of example, this is also due to the fact
that the complexity of the structure is reduced as the telescope
and the optically imaging element have an integral embodiment.
Unwanted position tolerances between individual lens elements of a
telescope, as they occur in the related art, no longer occur in the
intraocular lens according to the aspect of the invention, and
thus, it is precisely the imaging property of the telescope which
is improved to a particular extent in relation to the embodiments
in the related art. As a result of the additional configuration
with the optically imaging element, an additional function in view
of the optical effect of the optical part is complemented beyond
the optical imaging properties of the telescope and hence the
entire optical imaging of the intraocular lens is improved, in
particular in the case of macular degeneration. By virtue of a
position fixation being formed according to an aspect of the
invention between the entire telescope and the optically imaging
element by the integration of these components, it is also possible
to avoid unwanted position tolerances and hence also
disadvantageous effects of the respective imaging properties of the
individual components, both on their own and with an operative
connection.
As a result of the integral construction of telescope and optically
imaging element, the intraocular lens obtains a relatively low
flexural rigidity, which is particularly advantageous for an
implantation, and which is suitable for a small incision into an
eye.
In particular, a telescope is an element through which distant
objects are seen with a larger field of view than with the free eye
and are therefore seen as if they are brought closer. The focal
length of the convex side of the telescope is greater than the
focal length of the concave side. As a result, a telescope also
differs substantially from a convex-concave lens.
In particular, provision is made for the telescope to be situated
centrally in the middle in a direction perpendicular to an optical
main axis of the intraocular lens and for the element acting with
optically defined imaging to be embodied as a ring element and to
be embodied immediately adjoining the telescope in this radial
direction. Therefore, this element imaging in an optically defined
manner completely surrounds the telescope on the circumferential
side in the circumferential direction about this optical main
axis.
According to an aspect of an exemplary embodiment, the telescope is
a convex-concave telescope which is embodied as a single lens
system. It is oriented in such a way that a front side facing the
incident light, in particular in a state of the intraocular lens
where it is implanted into the eye, of this telescope has a convex
curvature and a rear side facing away from the incident light of
this telescope has a concave curvature. This configuration obtains
a particularly advantageous magnifying effect and hence an
improvement in the visual field in the case of macular
degeneration. As a result of this magnification, the regions
impaired by macular degeneration are virtually no longer imaged or
practically displaced far to the edge of the visual field, and
hence an improved eyesight impression of the patient is
obtained.
Preferably, provision is made for the convexly curved front side to
have a greater radius in a direction perpendicular to the optical
main axis of the intraocular lens than the concavely curved rear
side. As a result, the aforementioned advantages are promoted again
and a specific imaging capability is obtained in the case of a very
compact intraocular lens which, in particular, is very thin in the
direction of the optical main axis. Hence, an implementation, which
is suitable for a small incision into the eye is possible in a
particularly good manner.
This configuration also means that an asymmetry is formed in
respect of the lengths over which the concavely curved rear side
and the convexly curved front side extend in the radial direction
in relation to the optical main axis and hence perpendicular to the
optical main axis.
According to an aspect of an exemplary embodiment, the telescope is
entirely cavity-free and hence it is formed as a virtually solid
body. As a result, firstly, the telescope has high inherent
stability. Secondly, this configuration is able to avoid unwanted
light ray deflections which occur on account of different media and
hence on account of different refractive indices. As a result, the
visual field adaptation in the case of macular degeneration may be
carried out in an even more defined and precise manner.
According to another aspect of the invention, the telescope extends
on both sides beyond the optically imaging or the optically
effective element radially adjoining the telescope when viewed in a
direction of an optical main axis of the optical part and hence
also of the intraocular lens. Hence, the telescope projects beyond
the optically imaging element to the front and to the back in this
axial direction.
According to yet another aspect of the invention, a front side of
the telescope faces the incident light to have a smaller radius
than a front side of the optically imaging element and a kink is
formed at a transition between the front side of the telescope and
the front side of the optically imaging element. The imaging effect
of the telescope may be improved by this non-flush and hence
discontinuous contour profile or by arching appearing as a bulge in
relation to the front side of the optically imaging element.
According to a further aspect of the invention, a concavely curved
rear side of the telescope facing away from the incident light is
embodied as an opening into a lateral wall of the telescope and a
kink is formed at a transition of a contour profile between the
lateral wall and a rear side of the optically imaging element. This
also promotes the imaging property of the telescope in view of
extending the visual field in the case of macular degeneration.
These forms and geometries of the front side and the rear side of
the telescope, which respectively project to the front and to the
back in the direction of the optical main axis and which are
raised, when compared with the front side and rear side of the
directly adjoining optically imaging element, are advantageous
since this also enables a very lateral incidence of light and/or an
oblique incidence of light into the telescope.
The desired imaging properties, which are also different in that
case, of the separate components are amplified and the precision
for the visual field adaptation in the case of macular degeneration
is improved by the specific transitions, respectively provided with
a kink, or the boundaries, formed thereby, of the front and sides
and the rear sides of the telescope on the one hand and of the
element with the optically imaging effect on the other hand.
Preferably, the optically imaging element is a monofocal lens. In
particular, the optically imaging element is a ring lens.
According to an aspect of an exemplary embodiment, the intraocular
lens has a magnification factor of at least 1.35, in particular
greater than 1.5, through the telescope. Such relatively large
magnification values substantially promote the visual field
adaptation in the case of macular degeneration.
In addition, or instead of this, provision can be made for the
intraocular lens, in particular the telescope, to have a central
thickness of less than 2 mm as measured along the optical main axis
of the intraocular lens. Such a thin configuration of the
intraocular lens, in particular in the optical part on the optical
main axis, substantially promotes an implantation, which is
suitable for a small incision, into an eye. Such a flat intraocular
lens can be folded to be very small and therefore can be introduced
into the eye through a relatively small incision in the eye.
According to an aspect of the invention, the material of the
optical element and of the telescope has a refractive index of
greater than 1.45.
According to an aspect of an exemplary embodiment, a magnification
or magnification factor of at least 1.6 is achieved with, at the
same time, a central thickness of at most 2 mm, in particular by
the specific geometry of the telescope and of the optically imaging
element, for example with a refractive index value of 1.46. The
same magnification factor can be achieved with a higher refractive
index value in the case of a reduced central thickness. An increase
in the magnification factor can be achieved in the case of the same
central thickness by way of a higher refractive index of the
material of the telescope and of the optically effective element.
Accordingly, a reduction in the central thickness in the case of
the same magnification factor can be achieved by increasing the
refractive index value of the material of the telescope and of the
optically effective element. Preferably, the intraocular lens is
embodied such that, in the case of the refractive index value of
1.58, the central thickness is reduced by at least 45 percent with,
however, the same magnification factor in comparison with a
configuration with a material having a refractive index value of
1.46.
Peripheral vision with the intraocular lens is also facilitated by
the additional optically imaging element, in particular in the form
of a ring surrounding the telescope radially to the outside and on
the circumferential side. This additional peripheral vision is also
particularly advantageous for patients with macular degeneration,
also in view of imaging the entire visual field.
According to an aspect of an exemplary embodiment, a diffractive
structure is embodied on a front side of the telescope facing the
incident light in the case of light incident on the intraocular
lens. Additionally, or instead, a diffractive structure is embodied
on a rear side of the telescope facing away from the incident
light. By way of example, a diffractive structure may be formed by
Fresnel zones. Such diffractive structures obtain a reduction in
the central thickness of the optical part in a particularly
advantageous manner since the telescope too may be embodied to be
smaller in terms of its extent in the direction of the optical main
axis. According to another aspect of the invention, such a
diffractive structure also extends the functionality of the
intraocular lens to the extent that it is also a depth of field
lens and thereby increases the depth of field. Such an intraocular
lens facilitates an improved visual field adaptation, precisely for
patients with macular degeneration, by way of the magnification
effect of the telescope and at the same time improves sharp imaging
over a larger range by increasing the depth of field.
According to an aspect of the invention, the optically imaging
element is designed in such a way that it has a refractive power of
between 15 and 25 diopters, preferably between 17 and 22 diopters,
in particular 20 diopters.
According to a further aspect of an exemplary embodiment, a front
side and/or a rear side of the optically imaging element is not a
continuous spherical or aspherical surface but for at least one
step is embodied in the respective surface profile. In particular,
it is thus also possible for a diffractive structure to be embodied
on the optically imaging element. Specifically, if diffractive
structures are embodied both on the front side and/or the rear side
of the optically imaging element and on the front side and/or the
rear side of the telescope, the diffractive structures have
different embodiments in view of their number of diffractive
elements, in particular in the form of Fresnel zones, and/or in
view of the geometric configurations of these diffractive
zones.
Light beams incident in spherical waves may be converted into
exactly plane waves, or vice versa, by way of the intraocular lens
according to an aspect of the invention or an advantageous
configuration thereof. It is also possible to exactly convert
spherical waves, whether they be convergent or divergent, into
other exact spherical waves, which may also be convergent or
divergent. The diameters of incident light beams may be modified by
the intraocular lens. A wave, e.g., a plane wave, incident at the
front surface or at the front side and converted into a convergent
spherical wave by the telescope and this convergent spherical wave
may, once again, be converted into a plane wave at the rear side of
the telescope. The diameter of the resultant converted plane wave
then always is smaller in this case than the diameter of the
incident plane wave.
Further features of the exemplary embodiments of the invention
emerge from the claims, the figures and the description of the
figures. The features and feature combinations mentioned in the
description above and the features and feature combinations
mentioned in the description of the figures and/or only shown in
the figures may be used not only in the respectively specified
combination, but also in other combinations or on their own,
without departing from the scope of the invention. Hence, exemplary
embodiments of the invention which are not explicitly shown and
explained in the figures but which emerge from the explained
exemplary embodiments by way of separate feature combinations and
which are producible should therefore also be considered to be
included and disclosed. Therefore, exemplary embodiments and
feature combinations which do not have all features of an
originally phrased independent claim should also be considered to
be disclosed.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention will now be described with reference to the drawings
wherein:
FIG. 1A shows a perspective illustration of a first exemplary
embodiment of an eye lens according to the invention;
FIG. 1B shows a perspective illustration of a further exemplary
embodiment of an eye lens according to the invention;
FIG. 2 shows a vertical sectional illustration through the first
exemplary embodiment of an intraocular lens according to the
invention;
FIG. 3 shows a vertical sectional illustration through a second
exemplary embodiment of an intraocular lens according to the
invention;
FIG. 4 shows a vertical sectional illustration through a third
exemplary embodiment of an intraocular lens according to the
invention; and
FIG. 5 shows a vertical sectional illustration through a fourth
exemplary embodiment of an intraocular lens according to the
invention.
DESCRIPTION OF EXEMPLARY EMBODIMENTS
In the figures, equivalent or functionally equivalent elements are
provided with the same reference numerals.
FIG. 1A shows a first exemplary embodiment of an intraocular lens 1
in a perspective illustration. The intraocular lens 1 includes an
optical part 2 and, adjoining it, an optically ineffective haptic
part 3, or haptics, which is only embodied to hold the intraocular
lens 1 in the eye. The intraocular lens 1 is foldable and may be
introduced into an eye through a small incision. The optical part
2, which defines the optical imaging property of the intraocular
lens 1, includes an optical main axis A, which is perpendicular to
the optical part 2. Moreover, when viewed in the direction of this
optical main axis A, the optical part 2 includes a first optical
area or side 4a, which may be a front side, and, opposite thereto,
a second optical area or side 4b, which may be a rear side. In the
implanted state of the intraocular lens 1 in the eye, the first
optical side 4a faces the cornea, whereas the second optical side
4b faces away from the cornea.
FIG. 1B shows a further exemplary embodiment of an intraocular lens
1 in a perspective illustration. It differs from the exemplary
embodiment shown in FIG. 1A by different haptics 3. The intraocular
lens 1 is held in the eye by the haptics 3. In principle, provision
may also be made of differently shaped and configured haptics
3.
As may be identified schematically in the illustrations in FIGS. 1A
and 1B, the intraocular lenses 1 each have a specifically embodied
optical part 2. In this context, the respective optical part 2
includes, in particular, an optically imaging element 5 and a
telescope 6 in each case. The complete or entire telescope 6
respectively has an integral embodiment, and hence it is embodied
as a single part, in FIGS. 1A and 1B. Moreover, this telescope 6 is
integrated into the optically imaging element 5 and therefore also
has an integral embodiment with the optically imaging element 5
and, in particular, it is also produced in integral fashion
therewith. This means that the telescope 6 is embodied in a common
production process together with the optically imaging element
5.
In this context, the integral optical part 2 may be made from a
polymer material.
FIG. 2 shows the first exemplary embodiment of the intraocular lens
1 in a schematic vertical sectional illustration and hence in a
sectional plane containing the optical main axis A and extending
through the haptics 3 and the optical part 2. The exemplary
dimensional specifications may also be embodied differently but
provide relative values in view of the relative sizes of individual
parts of the intraocular lens 1 and, in particular, of the
individual parts of the optical part 2.
In the illustration of FIG. 2, it is possible to identify that the
telescope 6 is a Galilean telescope. The integral telescope 6 is
embodied symmetrically about the main axis A and sits centrally in
the middle in the optical part 2. As viewed in a direction
perpendicular to the main axis A and hence in the radial direction
in relation to the main axis A, this is then followed by the
optically imaging element 5, which is embodied as a ring and which
surrounds the telescope 6 in a circumferential manner about the
main axis A.
In the shown exemplary embodiment, the optical side 4a represents a
front side, meaning that this optical side 4a faces the cornea in
the implanted state of the intraocular lens 1 in the eye, in
particular in the capsular bag. By contrast, the optical second
side 4b then faces away from the cornea in the exemplary
embodiment.
In the exemplary embodiment, the optically imaging element 5 is a
monofocal lens with a biconvex embodiment. To this end, a front
side 5a facing towards the cornea in the implanted state or facing
the incident light has convex curvature, and a rear side 5b, facing
away from the incident light, of this optically imaging element 5
likewise has convex curvature. In an exemplary embodiment, the
optically imaging element 5 preferably has a refractive power of 20
diopters, for example.
As may also be seen in FIG. 2, the telescope 6 is embodied as a
solid component and hence embodied without a cavity. Hence, the
entire body of the telescope 6 is filled with the polymer material.
The telescope 6 is a single lens system.
As may be recognized, the telescope 6 represents a convex-concave
telescope. In this context, a front side 6a facing the incident
light and therefore also facing the cornea in the implanted state
in the eye has a convexly curved embodiment, in particular a
completely convexly curved embodiment. A rear side 6b, facing away
from the incident light and therefore also facing away from the
cornea in the implanted state of the intraocular lens 1, of the
telescope 6 has concave curvature, in particular, a completely
concave curvature.
As may furthermore be seen in FIG. 2, the convexly curved front
side 6a has a greater radius 7 in a direction perpendicular to the
main axis A than the curved rear side 6b, when considered in this
direction, which has a smaller radius 8 in this context. Hence, the
telescope 6 has a tapering embodiment when considered from the
front side 6a thereof to the rear side 6b thereof--along the main
axis A. It therefore represents a cone-like shape, wherein this
cone then has the specifically convexly shaped front side 6a and
the specifically concavely shaped rear side 6b. As may moreover be
identified, the curvature of the front side 6a is different from,
in particular smaller than, the curvature of the rear side 6b since
a radius 16 of the front side is greater than a radius 17 of the
rear side 6b.
It is furthermore possible to identify that the radius 16 of the
convex form of the front side 6a is less than a radius 18 of the
convex form of the front side 5a of the optically imaging element 5
and a radius 19 of the rear side 5b. Therefore, a clear transition,
which is realized by a kink 9, is embodied between the telescope 6
and the optically imaging element 5. The telescope 6 arches in a
raised fashion to the front or to the outside in relation to the
convex arching of the front side 5a of the optically imaging
element 5 at this front first side 4a of the optical part 2.
Therefore, when viewed in the direction of the optical main axis A,
the telescope 6 extends beyond the optically imaging element 5
toward the front with its entire dimension in the direction
perpendicular to the main axis A. This means that the front side
6a, which starts at the kink 9 with an edge or an end, then already
extends further forward from this edge or this end than the point
of the front side 5a lying furthest to the front in this respect
when viewed in the direction of the main axis A.
When viewed along the main axis A, the exemplary embodiment also
provides for the telescope 6 to have a raised embodiment toward the
rear in relation to the convexly curved rear side 5b and for it to
extend further to the outside or to the back. Here too, a kink 11
is formed at a confluence or coming together of the rear side 5b
and a lateral wall 10 of the telescope 6. The lateral wall 10 is
optically inactive. The concavely curved rear side 6b only opens
into the lateral wall 10 and is only connected to the rear side 5b
by the lateral wall 10.
In particular, the telescope 6 may be provided in an exemplary
embodiment that has a magnification factor of at least 1.35, in
particular greater than 1.5, and a central thickness 12 of the
optical part 2, in particular of the telescope 6, being less than
or equal to 2 mm as measured along the optical main axis A and the
material of the optical part 2 having a refractive index of at
least 1.45 or more.
FIG. 3 shows a further exemplary embodiment of an intraocular lens
1 in a further vertical sectional illustration. In contrast to the
illustration in FIG. 2, the intraocular lens 1 only has different
dimensions of the telescope 6 in comparison with the element 5.
FIG. 4 shows another exemplary embodiment of an intraocular lens 1
in a further vertical sectional illustration, with only an upper
part above the optical main axis A being illustrated in this case.
As can be seen here, a diffractive structure 13 is applied in
regions onto the surface of the convexly curved front side 6a, said
diffractive structure being a plurality of Fresnel zones in the
exemplary embodiment. Moreover, the exemplary embodiment provides
for a further diffractive structure 14 also to be applied onto the
concavely curved rear side 6b of the telescope 6, at least in part
onto this concavely curved surface, said further diffractive
structure preferably likewise being formed by a plurality of
Fresnel zones.
Provision may also be made for a diffractive structure 13 or 14 to
be respectively applied only onto the front side 6a or only onto
the rear side 6b. The diffractive structures 13 and/or 14 are
formed in an outer region of the telescope 6 adjoining the
optically imaging element 5 in the radial direction and are
therefore only formed in regions on the front side 6a and/or the
rear side 6b in the exemplary embodiment.
In particular, provision can be made for the diffractive structures
13 and 14 to be different. This means that the number of the
diffractive zones may be different and/or the geometric
configurations of the diffractive zones may be different.
The illustration in FIG. 4 also, in turn, specifies a scaling in
the vertical direction and horizontal direction, and, here too, the
values should be understood to be true to scale, in particular in
view of the dimensional relationships of the individual parts of
the intraocular lens 1.
FIG. 5 shows a further example embodiment of an intraocular lens 1
in a vertical sectional illustration, with only an illustration
above an optical main axis A being shown here in a manner
corresponding to FIG. 4. In this embodiment, provision is made for
the front side 5a and also the rear side 5b of the optically
imaging element 5, respectively, to have a diffractive structure
and to have a stepped exemplary embodiment in this context and
therefore not to have a continuous convex shape.
Provision may also be made for only the front side 5a or only the
rear side 5b to have such a diffractive structure.
Monofocal regions 15a, 15b, and 15c are formed by this exemplary
embodiment.
It is understood that the foregoing description is that of the
exemplary embodiments of the invention and that various changes and
modifications may be made thereto without departing from the spirit
and scope of the invention as defined in the appended claims.
* * * * *